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THE INFLUENCE OF ALKALI-METAL COMPOUNDS ON THE COMPACTION AND EARLY STRENGTH PROPERTIES OF LIME-SOIL MIXTURES

THE PAPER EXAMINES THE IMPORTANCE OF CLAY TYPE AND LIME TYPE IN RELATION TO THE EARLY STRENGTHS OF SOILS STABILISED WITH LIME AND THE ALKALI METAL COMPOUNDS: SODIUM HYDROXIDE, POTASSIUM HYDROXIDE AND SODIUM CARBONATE. IT WAS CONCLUDED THAT LIME TYPE WAS NOT OF MAJOR IMPORTANCE IN RELATION TO THE DRY UNIT WEIGHTS OR EARLY STRENGTHS OF LIME-CLAY-ALKALI METAL COMPOUND SYSTEMS; OF MUCH MORE IMPORTANCE WERE THE NATURE OF THE SOIL AND THE SECONDARY CHEMICAL ADDITIVE. FURTHER, THERE WAS LITTLE ADVANTAGE IN USING THE ALKALI METAL COMPOUNDS WITH SOIL-LIME AS COMPARED WITH SOIL CEMENT. SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE INCREASED THE MAXIMUM DRY UNIT WEIGHTS OF THE LIME-SOIL MIXTURES, WHEREAS VARIABLE RESULTS WERE OBTAINED WITH SODIUM CARBONATE. THE MOST SIGNIFICANT INCREASE IN THE RATE OF POZZOLANIC REACTION WAS BROUGHT ABOUT BY ADMIXING SODIUM HYDROXIDE, HOWEVER, IT WAS CONCLUDED THAT THE 7-DAY STRENGTH INCREASES ASSOCIATED WITH THIS ADDITIVE WERE DUE NOT ONLY TO INCREASES IN THE AMOUNTS OF POZZOLANIC REACTION PRODUCTS, BUT ALSO TO INCREASES IN DRY UNIT WEIGHT BROUGHT ABOUT BY THE ADMIXTURE. /AUTHOR/